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Mademuasel [1]
3 years ago
14

A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works? It removes

thermal energy from the air inside the container. It removes thermal energy from the frozen foods inside the container. It reduces the amount of thermal energy that is transferred from inside to outside the container. It reduces the amount of thermal energy that is transferred from outside to inside the container.
Physics
1 answer:
Allushta [10]3 years ago
6 0

Answer:

the foam an insulator............

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A 34-kg child runs with a speed of 2.8 m/s tangential to the rim of a stationary merrygo-round. The merry-go-round has a momentu
tekilochka [14]

Answer: 0.43\ rad/s

Explanation:

Given

Mass of child m=34\ kg

speed of child is v=2.8\ m/s

Moment of inertia of merry go round is I=510\ kg.m^2

radius r=2.31\ m

Conserving the angular momentum

\Rightarrow mvr=I\omega \\\Rightarrow 34\times 2.8\times 2.31=510\times \omega\\\\\Rightarrow \omega=\dfrac{219.912}{510}\\\Rightarrow \omega=0.43\ rad/s

7 0
3 years ago
When jumping, a flea reaches a takeoff speed of 1.0 m/s over a distance of 0.47 mm .What is the flea's acceleration during the j
garri49 [273]
We can use kinematics here if we assume a constant acceleration (not realistic, but they want a single value answer, so it's implied). We know final velocity, vf, is 1.0 m/s, and we cover a distance, d, of 0.47mm or 0.00047 m (1m = 1000mm for conversion). We also can assume that the flea's initial velocity, vi, is 0 at the beginning of its jump. Using the equation vf^2 = vi^2 + 2ad, we can solve for our acceleration, a. Like so: a = (vf^2 - vi^2)/2d = (1.0^2 - 0^2)/(2*0.00047) = 1,064 m/s^2, not bad for a flea!
8 0
3 years ago
Read 2 more answers
Find the radius of the path described by a proton moving at 15 km/s in a plane perpendicular to a 400-g magnetic field.
Jet001 [13]

Answer:

The radius described the proton moving is

r=3.91mm

Explanation:

The magnetic field that moving the proton with the velocity

v=15 km/s

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r = mv=eB

r = mv/eB

r=\frac{(1.67*10^{-27})*(15\frac{km}{s})}{(1.6*10^{-19})(4*10^-2kg)}

r = 3.9mm

6 0
3 years ago
Where can protozoa be found?
Semenov [28]
<span>Protozoa live in seas, rivers, lakes, ponds, decaying matters and soil</span>
8 0
4 years ago
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If the wheels lock when braking suddenly the vehicle: a:loses traction b:lose steering wheel ability c: gain speed slightly d:ga
kolezko [41]

Answer:

b

Explanation:

8 0
4 years ago
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